From f3c1e3b2eedff1c2cafec81306751eb0a7c95628 Mon Sep 17 00:00:00 2001
From: Alexander Ebert <ebert@woltlab.com>
Date: Mon, 2 Sep 2019 16:44:12 +0200
Subject: [PATCH] Optional override for the ImageMagick filter

Closes #3057
---
 .../adapter/ImagickImageAdapter.class.php     | 21 ++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/wcfsetup/install/files/lib/system/image/adapter/ImagickImageAdapter.class.php b/wcfsetup/install/files/lib/system/image/adapter/ImagickImageAdapter.class.php
index 36bb7bcd09..ca392af0b2 100644
--- a/wcfsetup/install/files/lib/system/image/adapter/ImagickImageAdapter.class.php
+++ b/wcfsetup/install/files/lib/system/image/adapter/ImagickImageAdapter.class.php
@@ -1,5 +1,6 @@
 <?php
 namespace wcf\system\image\adapter;
+use wcf\system\event\EventHandler;
 use wcf\system\exception\SystemException;
 
 /**
@@ -179,7 +180,7 @@ class ImagickImageAdapter implements IImageAdapter {
 		else {
 			$this->clip($originX, $originY, $originWidth, $originHeight);
 			
-			$this->imagick->resizeImage($targetWidth, $targetHeight, \Imagick::FILTER_POINT, 0);
+			$this->imagick->resizeImage($targetWidth, $targetHeight, $this->getResizeFilter(), 0);
 		}
 	}
 	
@@ -416,6 +417,24 @@ class ImagickImageAdapter implements IImageAdapter {
 		// does nothing
 	}
 	
+	/**
+	 * Returns the preferred image filter used during image resizing.
+	 * 
+	 * @return int
+	 */
+	protected function getResizeFilter() {
+		static $filter;
+		
+		if ($filter === null) {
+			$parameters = ['filter' => null];
+			EventHandler::getInstance()->fireAction($this, 'getResizeFilter', $parameters);
+			
+			$filter = $parameters['filter'] ?? \Imagick::FILTER_POINT;
+		}
+		
+		return $filter;
+	}
+	
 	/**
 	 * @inheritDoc
 	 */
-- 
2.20.1